Ex.The growth of the Internet in China from the mid 1990s onwards has been accompanied by the assumption that a large proportion of Chinese Internet users are interested in politically subversive action.

* * *

= from the mid + Expresión Temporal + onwards

Ex: The growth of the Internet in China from the mid 1990s onwards has been accompanied by the assumption that a large proportion of Chinese Internet users are interested in politically subversive action.

* desde entonces = ever since, henceforth, in the interim, since, since that time, since then, henceforward, ever since then, ever since then, thenceforth, in the intervening years, ever after, in the intervening period, since that day.

* desde entonces= ever since, henceforth, in the interim, since, since that time, since then, henceforward, ever since then, ever since then, thenceforth, in the intervening years, ever after, in the intervening period, since that day.

s.XX C20siglo sustantivo masculino (período) century;
hace siglos or un siglo que no le escribo (fam) I haven't written to her for ages (colloq)
siglosustantivo masculino century
a comienzos del siglo XV, at the beginning of the 15th century
este tapiz data del siglo IV, this tapestry dates from the fourth century
Siglo de las Luces, Age of Enlightenment
fam (mucho tiempo)hacía siglos que no la veía, I had not seen her for ages
♦ Locuciones: por los siglos de los siglos, for ever and ever
el crimen del siglo, the crime of the century